officials are convinced al qaeda's central he'dership in pakistan and afghanistan have been pushed to the brink of collapse. and they're concerned about its affiliate in somalia's ability to strike within the us use probably the next, most significant terror threat may emnate from the al qaeda presence in somalia. >> abc news learned before he died, osama bin laden had been secretly urging al qaed's affiliate in somalia to target the u.s.. and many there is a civil war alongside islamic radicals, sources tell abc news 40 have trained and fought there in three years alone, including three suicide bombers. >> not al qaeda nor any facilities have come close to drawing muslim americans and westerners to jihad. >> the recruits have come from across the country. california, minnesota, illinois, missouri, new york, new jersey, virginia, alabama, and texas. >> they continue to call for strikes against the united states. as a result we cannot and will not let our guard down. >> there is disturbing evidence the group is forging an alliance with aggressive al qaeda affiliate in yemen. a senior a